Socket-wrench for headless screws.



WQKLLBRMBER. WRENCH FOR LESS SOREWS.

PLIGATION FIL Patented Dec. 24, 1912.

SOCKET invrrnn sTArns rATNfr OFFICE.

WILHELM KLLERMEYER, oF HRDE, GERMANY. l

SOCKET-WRENCHBFOR HEADLESS SCREWS.;

Specification of Letters Patent. .Patented Dec. 24, 1912.

. Application led August 8, 1911. 'Serial No. 643,067. i

oful Improvements in Socket-'Wrenches for Headless Screws, of which thefollowing is a specification. A

.The subject-matter of my invention is a socket-wrench which admits ofgrub or headless screws being rapidly screwed outward or inward withoutthe usual employment of lock nuts.

One illustrative embodiment of the invention and a modification thereofarerepresented byway of example in the accompanying drawing, wherein?-Figure l is an elevation, partly in section, showing my socket-wrenchand a headless screw partly'screwed intoa-workpiece,

and Fig. 2 is a top plan view of the same;

Fig. 3 is an elevation, partly in section,

i showing a modified form of wrench, Fig. 4

a -plan view ofthe modified form and Figs. 5 and 6 show details of thelatter form.

Referring firstly to Figs-.l and 2, my socket-wrench comprises theholder or handle ahaving a square head b and a socket c provided with aninternalthread adapted to theheadlessscrewwhich is to be screwed outwardor. inward.v Above the screwedy portion of thesocket is a chamber dcontaining a hardsteel,v cylindrical. pressure member e having a ribbedbottom face f.

My wrench is used asf follows :eThe

holder a is'screwed onto the screw h which is to be.screwed in'to `'theworkpiece forexample. By means of a light-blowfon -the wedge g' themember e is placed firmly on. `the top end of .the screw h so that whenthe` y' holder d is turnedby means ofca key placed the holder a anditsmembere being screwe lightly on the screw It to be withdrawn, wereupon the wedge. istightened and thev -holder turned in t eoppositedirection.

The member e will be kept in stock in various lengths corresponding tothe lengths of the screws to belemployed. When the member eis a suitablelength quite short and broken screws which otherwise had to be drilledout can be seized and screwed out by means of my improved wrench. l

The above described form of wrench is,l

' the headless screws which are employed.

For those cases, on the other hand, when it is desirable `that only onesingle wrench or a small number of wrenches is requisite, for examplefor fitters, in tool-boxes for motor-cars, and so on, I preferablyemploy the form represented in Figs. 3 to 6 which admits of one singlewrench being employed for various diameters of screws.

Referring to Figs. 3 to 6, in this form the lower part 7c of the socketof the holder a is smooth and providedwith ya slot Z whose inner endforms a shoulder m. This slot contains a nut n, its outer edgepreferably terminating iush with the outside of theg holder. The nut nAis approximately rectangular in shape, as clearly shown in Figs. 5 and6, and has an internally-threaded --hole o into which the headless screwh is screwed. For each customary diameter of headless screw a .specialnut having a suitable `screw thread will be kept in stock and insertedin or removed from the wrench as required. Instead of the fiat wedge inthe form described with reference to Figs. 1 and 2;.,Iv here employ around wedge 77 for pressingthe ribbed pressure member e against thescrew. This wrench is used in the same manner as that described abovewith reference toy Figs. land 2.

Headless screws of be screwed in by' means of the wrenchaccording t0Figs. 3 vto 6 which is preferably any desired size canmade in, say, vtwoto three sizes and with nuts for' every stockscrew-thread so that Thetensioning between'the headless screw and the holder a may; also bebrought about by the pressure member e being pressed by another member,e. g., a screw, against the headless screw h.

I claim A socket Wrench for headless screws com-V prising incombination, a handle having a socket provided with a slot at one side,said socket being adapted to be placed over a headless screw, anexchangeable nut in said socket and said slot, a pressure member 1ocatedin the socket and having a ribbed bottom face in contact Wit-h the endof the screw, and a Wedge passing through the holder immediately abovesaid member.

WILHELM KLLERMEYER.

Witnesses:

CHAS. J. WRIGHT, ALFRED HENKEL.

